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PATENT OFFICEO CHARLES E. CLARK, OF BELMONT, NEW YORK.

SAW-M I LL DOG.

SPECIFICATION forming part of Letters Patent No. 285,969,

dated October 2, 1883.

Application filed May19.1 883. (No model.)

f0 (LIZ whom it 127 605! concern Be it known that 1, CHARLES E. CLARK, a

' citizen of the United States of America, residits consists in certain improvements therein,

which will be more fully hereinafter described, and then pointed out in the claims.

In the accompanying drawings, Figure 1 represents a side elevation of ahead-block and knee with my dogging mechanism; Fig. 2, an end view of the same; Fig. 3, a sectional detiil, and Fig. 4 a modification of the knee.

A represents a head-block, on which slides the knee B in the usual manner.

0 represents a lever pivoted at b, and having a steel bit, 0, projecting from its under side, and an arm, D, rising above it, provided with a hook or projection, d.

At E is a lever carrying the weight or hammer F at one end, and having the handlever c at the other, which lever is pivoted atthe same point as the lever O; or it may be pivoted above it, or to the end of lever C, or near it.

At Gis represented a curved bar securely attached at its opposite end to the top and back end of the knee, and provided with a stop. y. Only one of these bars is seen in Fig. 1; but there may be two to each knee, as shown in Fig. 2, with the lovers 0 E (2 working in the space between them. 4

At H is shown anotherlever, also fulcrumed at b, and having the handle 71. At the free end of the lever is pivoted a link, I, which is connected with a weight, J, slidingon a guidebar, K, connected at top and bottom with the knee in any suitable manner. As shown in the drawings, the top of the rod is connected to a stay, 76, and its bottom to a stud, 7;, projecting from the lower part of the knee. The

weight J is partly hollow, (see Fig. has connected with it the head L, bit M securely fastened therein.

3,) and The head is connected with the weight by a pin, Z, fast in' the head L, and sliding in a-slot, j, in the weight. It will be observed that the opening in the head L fits the bar K snugly at its uphaving theper end, but has its opening large enough at its lower end to admit of sufficient side move ment to allow the bit M to project from the face of the knee when required to dogaboard, or to be forced back by the cant when not in use. As the head L is suspended from one side of its center of gravity, it will, when raised clear of the cant or board, automatically assume the position shown in Fig. 3.

WVhen the dogis not in use, it(with theham mer,) lies back against the pin g, (or any suit able stop,) as shown in dotted lines in Fig. 1, and being, when in that position, back of a vertical line drawn through the pivot,will be held from moving forward by its own weight.

In dogging a log the operator should take hold of the lever e and throw the hammer F' and bit 0 forward past the vertical line, and they will then drop forward and down by the force of gravity, and usually this will force the bit far enough into the log to hold it firmly in place but when necessary the hammer may be drawn away or raised from the bit by pulling gently 011 the lever c, and then driving it back forcibly against the bit, to drive the latter in deeper. To disengage the dog from the log, draw the lever 0 back quickly, and the lever E, carrying the hammer, striking against the hook or stop (Z on the arm D, will loosen the dog by the sudden concussion, and it may then be drawn back, as shown in dotted lines.

W'hena board is to be dogged, draw back or press down the lever h, and the weight J will be lifted, carrying with it the head L and dog M to the position shown in dotted lines, when by releasing the lever the weight will fall and force. the bit into the board. \Vhen necessary, the weight may be forced against the bit to drive it into the board; but this is not usually required. By operating the lever h in the reverse manner, so as to cause the weight to act on the under side of the pin Z, the concussion will loosen the dog M, andit can thus be easily withdrawn from the board.

I sometimes use a spiral or coiled spring above the weight J, to increasethe power thereof; but I do not regard this as essential.

Instead of being fulcrumed directly in the knee, thelevers, &c., may be fulerumed in the sliding box 0, Fig. 4, which bOX may be secured in any desired position to adjust the dog IOO 2 a I V s 285.969

to different widths. This Ishould consider the equivalent of having the fulcrum directly on the knee.

It is obvious that both of these dogging devices may be used at the same time, and thus the log be the more securely held; and it will also be seen that after the log is partly cut up the bit a, lever, 850., may be thrown back, as shown in dotted lines, and the log be then held by the bit M alone.

By the construction shown and described herein, a most convenient and eflicient means of dogging cants and boards is provided, that will securely hold them in place, and be convenient in operation, simple in construction, adapted to be used with all the varying sizes of logs, &c., and durable in use. I do not wish to be limited to the exact construction shown, as it is evident that it may be varied considerably without departing trom the spirit of my invention.

Vhat I claim as new is- 1. The combination, in a (logging apparatus, of a bit, a hammer, and suitable guiding and operating devices, substantially as described, to cause the hammer to drive the bit into the log, as set forth.

2. The combination, in a dogging apparatus, of a bit, a hammer, a connection between the hammer and bit, and suitable guiding and operating devices, substantially as described, whereby the bit may be withdrawn from the log by the motion of the hammer, as set forth.

3. The combination of aknee, B, and lever G, connected thereto and having bit a, with the lever E, also connected to the knee, and hammer F, attached to said lever E, substantially as described. 4-. The combination, with a knee, B, the lever 0, connected thereto and having bit 0, and arm D, connected to said lever, of the lever E, also connected to the knee and carrying the hammer F, substantially as described. 5. The combination, with a knee, 3, and the lever 0, having bit a, and lever E, having hammer F at its free extremity, both levers being fulcrumed on the knee, of a stop, 9, constructed to hold the levers and hammer back of their fulcrum, substantially as described.

6. The combination, with a knee, B, of the weight J, head L, working beneath said weight,

bit M, attached to thehead, and suitable guid- I carrying the bit and having a rising and ing and operating devices-for said weight and connected to the knee, weight J, sliding on said bar K, head L, and bit M, attached to said knee, substantially as described.

8. In a dogging apparatus, a swinging head fall'- ing motion, hung on one side of its center of gravity, and constructed to yield backward when struck by the log or cant, and automatically swing by its own gravity into position for operation as it rises, substantially as described.

9. The combination, with the knee B and weight J, of the head L, both constructed to rise and fall, and the latter carrying the dog M, and hung on one side of its center of gravity, substantiallyas described.

10. The combination, with the kneeB and guidebar K, connected thereto, ofthe weight J, moving on said guide-bar, and the head L, provided with the bit M, said weight J being loosely connected to the head, and constructed and arranged to have a portion of its motion when the head is stationary, substantially as described.

' 11. The combination, with the knee B and guide-bar K, and the weight J, sliding on said bar and having the slot j, of the head L, carryin g the bit M, and provided with the pin Z, work ing in slot 7', substantially as and for the purpose described.

12. The combination, with the knee B, the lever G, pivoted thereto, having bit 0 on its free end, and lever E, also pivoted to the knee and carrying the hammer F, of the lever H, also pivoted to the knee, guide-bar K, attached to the knee, weight J, sliding on said bar and connected to the lever 1-1, and head L, loosely connected to the weight and carrying the bit M, all constructed, arranged, and operated substantially as described.

In testimony whereof I. affix my signature, in

presence of two witnesses, this 11th day of May, 1883.

, CHARLES E. CLARK. Vituesses:

E. J. CLARK, (/HARLEs GORTON. 

